Adapting a construction of Viterbo, Abouzaid and Seidel defined a map $V$ between the wrapped Floer homologies of two pairs $(M,L)\subset (M',L')$ where $M,M'$ are Liouville domains and $L,L'$ suitable exact Lagrangians in $M$ and $M'$. $V$ is an isomorphism if $M'$ is obtained by attaching a subcritical handle on $M$ or a handle on a Legendrian that is loose in the complement of the boundary of $L$ in $M$. I will talk about the construction of $V$ and some consequences.